KID Rock’s fond of calling himself an “American Bad Ass”, but now he can add “Grandpa” to his list of titles. The 43-year-old rocker’s son Bobby Ritchie Jr is expecting his first child with his girlfriend, reports Us Weekly .

Rock welcomed his son with ex-girlfriend Kelley South Russell in 1993, and in 2000 won a custody battle for the then-seven-year-old, charging Russell $25 per week in child support. He went on to raise the child mostly on his own.

Kid Rock later married Pamela Anderson in 2006, but filed for divorce five months later after Anderson reportedly criticised his mother and sister in front of Bobby Ritchie Jr.